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TLS Online TPP Program

#Question id: 648

Enzyme catalysis is regulated by a number of mechanisms. Also, the flux through metabolic pathways must be regulated. Given the metabolic pathway below, which choice accurately describes the regulation of compound G levels?

#Section 2: General Biology

  1. G is regulated by chemical modification of the enzyme that catalyzes step 3.

  2. G serves as an inhibitory effector of the allosteric enzyme that catalyzes step 3.

  3. G inhibits the expression of the enzyme that catalyzes the formation of D.

  4. The reversible reaction of B to D is converted to an irreversible reaction.

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TLS Online TPP Program

#Question id: 15644

#Section 4: Fundamentals of Biological Engineering

Based on the flow behavior of fluids depicted in the following figure. choose the correct option.
TLS Online TPP Program

#Question id: 15645

#Section 4: Fundamentals of Biological Engineering

An aluminium pot contains water that is kept steadily boiling (100 °C). The bottom surface of the pot, which is 0.012 m thick and 1.5 x 104 mm2 in area, is maintained at a temperature of 102 °C by an electric heating unit. Find the rate at which heat is transferred through the bottom surface. Given k= 235 W.m-1.K-1
TLS Online TPP Program

#Question id: 15646

#Section 4: Fundamentals of Biological Engineering

The quantity of heat required to evaporate 1 kg of a saturated liquid is called
TLS Online TPP Program

#Question id: 15647

#Section 4: Fundamentals of Biological Engineering

A liquid stream is cooled from 80°C to 30°C in a double pipe heat exchanger as illustrated below: 

Fluid flowing counter currently with this stream is heated from 15°C to 30°C. Calculate the log mean temperature difference. 
TLS Online TPP Program

#Question id: 15648

#Section 4: Fundamentals of Biological Engineering

The main function of baffles in a bioreactor are
P. to prevent a vortex
Q. to increase aeration
R. to reduce interfacial area of oxygen transfer
S. to reduce aeration rate
TLS Online TPP Program

#Question id: 15649

#Section 4: Fundamentals of Biological Engineering

A bacterial culture having a specific oxygen uptake rate of 5 mmol O2 (g DCW)−1 h−1 is being grown aerobically in a fed-batch reactor. The maximum value of the volumetric oxygen transfer coefficient is 0.18 s−1 for the stirred tank bioreactor and the critical dissolved oxygen concentration is 20% of the saturation concentration (8 mg L−1). The maximum density to which the cells can be grown in the fed-batch process, without the growth being limited by oxygen transfer, is approximately